Make MyPy happy

Fixes for various type errors throw by mypy.

portal/model/Uuid.py

@@ -27,7 +27,7 @@ class Uuid(types.TypeDecorator):
         return types.String(UUID_LENGTH)
 
     def process_bind_param(
-        self, value: None | str | UUID, dialect: Dialect
+        self, value: Optional[str | UUID], dialect: Dialect
     ) -> Optional[str]:
         if isinstance(value, str):
             # Manually create UUID from string, to raise an error if the string is malformed